3 Digit Zip Functions

Up to 100 5 digit zip codes can be contained within a 3 digit zip code. For example, Minneapolis, MN can point at up to 100 detailed 5 digit zips (55400, 55401, 55402, ...).
The three digit zip code "554" points at the geographic center of all these zips.

This function allows selection of a 3 digit zip code, and a radius around the area. It returns the 3 digit zips within the
entered radius of the selected 3 digit zip code.

Similar to the previous function, this function allows selection of a 3 digit zip code, and a radius around the area. It returns the 5 digit zips within the
entered radius of the selected 3 digit zip code.

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